a = input()
b= int(input())
pi1 = '3.14'
pi2 = '3.1415'
pi3 = '3.1415926'
print(f'圆周率值为：{pi1:{a}{b}}')
print(f'圆周率值为：{pi2:{a}{b}}')
print(f'圆周率值为：{pi3:{a}{b}}')